Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f9e1a2b5b0b32f…

MALICIOUS

PDF

86.0 KB Created: 2021-07-06 07:50:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 15f32cabfc03a15d1f854f678ec758e6 SHA-1: 0fb46a510af3c5202719d20a72622268e6019762 SHA-256: 19f9e1a2b5b0b32ffe024e0f13dd077b004f770257d4f5763f398690b415eed1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the link farm and the presence of embedded URLs suggest potential for further malicious activity, such as downloading second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/q9odk6qpcdh352ch1nqthvi4vf/bilunetewazaronelufejutep.pdf In PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ef74dccc8a7e5d78258b87465004c87c/26510141841.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c5ca6b5b631404a11cdd8156048a076a/xekivavexen.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/b27g7g6ken9cembmmj9eait3i1/wuzugawelodi.pdfIn PDF document text
    • http://czechdidgeridoo.com/admin/upload/file/54325126659.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/37844053353.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b93558dd3fe---23773320979.pdfIn PDF document text
    • http://altelaw.com/uploads/image/file/ziveresakulajisefinar.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/vofojutod.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ed33d0b36---momefipeguxanizufu.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16081576b19b16---leduripeme.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad953236e0---sorono.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/43bcee0ebcd495a1193fc4135756149b/pozagilarim.pdfIn PDF document text
    • https://schmitz.cz/res/file/25154591758.pdfIn PDF document text
    • http://exclusivelimoservice.com/ckfinder/userfiles/files/febogesetop.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/jh8fgkbtvasjb0j8m0p8usobn6/17822129005.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ae2e605c0---96598820040.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/88224134129.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d85ab8d361e98d7e962c6f8556b8454a/14153576340.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/bapevalovip.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097187466a1e---26711339356.pdfIn PDF document text
    • http://short-story.ru/upload/file/vifekumudotinatitumikok.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a615c42c6d---14974543310.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/4cda855e72bafa8f344f3f698503a3d1/77056288640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+get+rich+with+no+skillsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4F 10516 bytes
SHA-256: 336740ff5d749e5c413fcb469c78f5338c7808cfe07534f0a24b04ce93fe90a6
font_01_sfnt_off0001032e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1032E 17628 bytes
SHA-256: e1d1393200753cef3f0a71d40e4e2ce6e70b199f059e68620b5801894206a765
font_02_sfnt_off0001310f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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